{
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\begin{tabular*}{\hsize}{@{\hskip\tabcolsep\extracolsep\fill}l*{3}{c}}
\toprule
                    &\multicolumn{1}{c}{(1)}&\multicolumn{1}{c}{(2)}&\multicolumn{1}{c}{(3)}\\
                    &\multicolumn{1}{c}{StewardShares I}&\multicolumn{1}{c}{StewardShares II}&\multicolumn{1}{c}{StewardShares III}\\
\midrule
Treatment (starting &       0.004         &      -0.003         &       0.008         \\
bid value at 100\%) &     (0.015)         &     (0.018)         &     (0.027)         \\
\midrule
Control group:      &                     &                     &                     \\
  - Mean            &        0.08         &        0.07         &        0.42         \\
Observations        &       3,195         &       1,611         &       1,082         \\
\bottomrule
\end{tabular*}
}
